Re: Is there a 'Ki Aikido' technique book?
Tohei Sensei has authored many books over the years, and some of his senior students have done so, as well. Much of the info is similar, and more like re-edited versions of the same material, so you can get the basic "flavor" from most any of them. Just search the web for aikido books with "ki" somewhere in the title, or for those directly authored by Tohei Sensei himself (there are about a dozen in this category). If you expect to learn ki development from a book, however, you will be disappointed. It is something that can only be learned firsthand, and a Ki-no-Kenkyukai school would be a good place to start.